Drinking fountain



FIG. 1 is a top, front perspective view of a drinking fountain showing my new design thereof;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a back elevational view thereof. 

The ornamental design for drinking fountain, as shown and described. 